Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, nhieu tang
thong cong » trong cong, tong cong, thong thong
hieu lang » hieu quang, nhieu tang, hieu van
cong cua » cong cu, dong cua, huong cua
manh cua » doanh cua, ban cua
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cao » toan ban, toan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sang) or (hieu lang)) - hang ((cong cua) or (manh cua)) thong cong tac toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (hieu lang)) - hang ((cong cua) OR (manh cua)) thong cong tac toan cao.
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (hieu lang)) - hang ((cong cua) or (manh cua)) thong cong tac toan cao*.